{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Disease", "Chemical"], "input": "DESIGN : The Expanded Clinical Evaluation of Lovastatin ( EXCEL ) Study , a multicenter , double - blind , diet - and placebo - controlled trial , in which participants were randomly assigned to receive placebo or lovastatin at doses of 20 or 40 mg once daily , or 20 or 40 mg twice daily for 48 weeks ."}
{"Disease": [], "Chemical": ["Lovastatin", "lovastatin"]}